RFR: 8358721: Update JCov for class file version 70

[Alexandre Iline]

JDK-8358721: Update JCov for class file version 70

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Commit messages:
 - JDK-8358721: Update JCov for class file version 70

Changes: https://git.openjdk.org/jdk/pull/25665/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25665&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358721
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/25665.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25665/head:pull/25665

PR: https://git.openjdk.org/jdk/pull/25665